CCKH 1.4

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Sea Floor Spreading 1.4

Vocabulary:


Mid-Ocean Ridge: longest chain of mountains in the world
Sonar: a device that bounces sound waves off under water objects and records the echos
Seafloor Spreading: the process that continually adds new material to the ocean floor.
Deep-Ocean Trench: forms where the oceanic crust bends downward
Subduction: the process by which the ocean floor sinks beneath a deep ocean trench and back into the mantle.

Outline:


  • Sea-Floor Spreading

    • East Pacific Rise
      • region of the Pacific Ocean
      • coasts of Mexico and South America
      • water heated by mantle material

  • Mapping the Mid-Ocean Ridge

      • mid-ocean ridge
      • sonar

  • Evidence for Sea-Floor Spreading

      • molten material rises from mantle
      • sea-floor spreading
    • Evidence from Molten Material
      • Alvin's submarine
      • found strange rocks
    • Evidence from Magnetic Stripes
      • direction of Earth's magnetic field
    • Evidence from Drilling Samples
      • the Glomar Challenger, drilling ship

  • Subduction at Deep-Ocean Trenches

      • deep-ocean trenches
      • subduction

  • Subduction and Earth's Oceans

    • subduction in the Pacific Ocean
      • pacific ocean covers more than 1/3 of the planet
    • subduction in the Atlantic Ocean
      • expanding ocean